CN116186862B - Design method of frame beam and straight barrel hinged connection node anchor bar of outer steel frame and water tower inner straight barrel combined support system - Google Patents
Design method of frame beam and straight barrel hinged connection node anchor bar of outer steel frame and water tower inner straight barrel combined support system Download PDFInfo
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Abstract
本发明属于土木工程领域，涉及一种外钢框架与水塔内直筒联合支撑体系的框架梁与直筒铰接连接节点锚筋的设计方法。锚筋包括弯折段和平直段，弯折段水平放置，与固定钢筋双面焊接，布置限位板限制锚筋位移。设计方法包括如下步骤：首先选择用于锚固的钢筋直径和排数；根据框架梁端受力情况按照公式计算锚筋的总截面面积；确定锚筋的锚固长度；确定锚筋平直段和弯折段长度；确定固定钢筋直径和长度。本发明为外钢框架与水塔内直筒联合支撑体系的框架梁与直筒铰接连接节点锚筋的设计方法，为水塔支撑体系中连接区锚筋的设计提供了可靠的分析方法。
The present invention belongs to the field of civil engineering, and relates to a design method for anchor bars at hinged connection nodes between frame beams and straight tubes of a combined support system of an external steel frame and a straight tube in a water tower. The anchor bars include a bent section and a straight section. The bent section is placed horizontally and welded to fixed steel bars on both sides. Limiting plates are arranged to limit the displacement of the anchor bars. The design method includes the following steps: first, the diameter and number of rows of steel bars used for anchoring are selected; the total cross-sectional area of the anchor bars is calculated according to the formula based on the stress conditions at the ends of the frame beams; the anchoring length of the anchor bars is determined; the length of the straight section and the bent section of the anchor bars is determined; and the diameter and length of the fixed steel bars are determined. The present invention is a design method for anchor bars at hinged connection nodes between frame beams and straight tubes of a combined support system of an external steel frame and a straight tube in a water tower, and provides a reliable analysis method for the design of anchor bars in the connection area of a water tower support system.
Description
技术领域Technical Field
本发明属于土木工程领域，具体涉及一种外钢框架与水塔内直筒联合支撑体系的框架梁与直筒铰接连接节点锚筋的设计方法。The invention belongs to the field of civil engineering, and in particular relates to a design method for anchor bars of a hinged connection node of a frame beam and a straight tube of a joint support system of an external steel frame and an inner straight tube of a water tower.
背景技术Background technique
在工业与民用建筑中，水塔作为一种高耸配水构筑物，在水塔顶部水箱施工过程中需要高空作业，施工难度较大，通常要设置合适的模板支撑体系，而支撑体系的稳定性主要依靠直筒本身和支撑体系的可靠连接来保证，通常采用锚筋作为连接件，所以水塔直筒上锚筋的设计对于支撑体系的稳定性至关重要。In industrial and civil buildings, water towers are tall water distribution structures. During the construction of the water tank on the top of the water tower, high-altitude operations are required, which makes the construction difficult. Usually, a suitable formwork support system must be set up. The stability of the support system mainly depends on the reliable connection between the straight tube itself and the support system. Anchor bars are usually used as connectors. Therefore, the design of the anchor bars on the straight tube of the water tower is crucial to the stability of the support system.
国内现有的锚筋设计方法，通常是根据受力情况以及锚板规格确定锚筋的截面面积，根据锚筋外形系数、钢筋直径、钢筋抗拉强度设计值和混凝土轴心抗拉强度设计值来确定锚筋的锚固长度，但是水塔筒壁厚度远远小于常规方法计算出的锚固长度。The existing anchor bar design method in China usually determines the cross-sectional area of the anchor bar according to the stress conditions and the specifications of the anchor plate, and determines the anchor length of the anchor bar according to the anchor bar shape coefficient, the steel bar diameter, the steel bar tensile strength design value and the concrete axial tensile strength design value. However, the thickness of the water tower wall is much smaller than the anchor length calculated by the conventional method.
发明内容Summary of the invention
本发明针对水塔直筒锚筋设计方法的不完善，提供了一种外钢框架与水塔内直筒联合支撑体系的框架梁与直筒铰接连接节点锚筋的设计方法。Aiming at the imperfection of the design method of the anchor bars of the straight tube of the water tower, the invention provides a design method of the anchor bars of the hinged connection nodes of the frame beam and the straight tube of the joint support system of the outer steel frame and the straight tube in the water tower.
为了达到上述目的，本发明包括以下步骤：In order to achieve the above object, the present invention comprises the following steps:
步骤一：选择用于锚固的钢筋直径d和排数n；Step 1: Select the diameter d and number of rows n of the steel bars used for anchoring;
步骤二：框架梁端节点区锚筋受剪力、拉力和弯矩，按照下列公式计算锚筋的总截面面积：Step 2: The anchor bars at the end node of the frame beam are subjected to shear force, tension and bending moment. The total cross-sectional area of the anchor bars is calculated according to the following formula:
β＝1-0.137ln(n-1) (4)β＝1-0.137ln(n-1) (4)
式中：As为锚筋总截面面积；αv为锚筋的受剪承载力系数；αb为锚板的变形折减系数；fy为锚筋抗拉强度设计值；V为剪力标准值；N为拉力标准值；M为弯矩标准值；z为沿剪力作用方向最外层锚筋中心线之间的距离；fc为混凝土轴心抗压强度；d为锚筋直径；t为锚板厚度；β为锚筋排数影响系数；n为锚筋排数，不少于两排；Where: As is the total cross-sectional area of the anchor bar; αv is the shear bearing capacity coefficient of the anchor bar; αb is the deformation reduction coefficient of the anchor plate; fy is the design value of the tensile strength of the anchor bar; V is the standard value of the shear force; N is the standard value of the tension force; M is the standard value of the bending moment; z is the distance between the center lines of the outermost anchor bars along the direction of the shear force; fc is the axial compressive strength of the concrete; d is the diameter of the anchor bar; t is the thickness of the anchor plate; β is the influence coefficient of the number of anchor bar rows; n is the number of anchor bar rows, not less than two rows;
步骤三：通过下列公式计算锚筋的锚固长度：Step 3: Calculate the anchorage length of the anchor bar using the following formula:
式中：l为锚筋锚固长度；α为锚筋表面系数，光圆钢筋取0.16，带肋钢筋取0.14；ft为混凝土轴心抗拉强度设计值；η为锚筋直径影响系数，d≤25mm时取1.0，d＞25mm时取1.2；λ为锚筋的抗震修正系数，对一、二级抗震等级取1.15，三级抗震等级取1.05，四级抗震等级取1.00；Where: l is the anchor length of the anchor bar; α is the surface coefficient of the anchor bar, which is 0.16 for round steel bars and 0.14 for ribbed steel bars; f t is the design value of the axial tensile strength of concrete; η is the influence coefficient of the anchor bar diameter, which is 1.0 when d≤25mm and 1.2 when d＞25mm; λ is the seismic correction coefficient of the anchor bar, which is 1.15 for the first and second seismic resistance levels, 1.05 for the third seismic resistance level, and 1.00 for the fourth seismic resistance level;
步骤四：按照下列公式计算锚筋平直段和弯折段长度：Step 4: Calculate the length of the straight section and the bent section of the anchor bar according to the following formula:
lb≤T-min(6d，70mm) (6)l b ≤T-min(6d，70mm) (6)
lc≥5d (7)l c ≥5d (7)
式中：T为水塔直筒厚度；lb为锚筋平直段长度；lc为锚筋弯折段长度；Where: T is the thickness of the water tower tube; l b is the length of the straight section of the anchor bar; l c is the length of the bent section of the anchor bar;
步骤五：按照下列公式计算固定钢筋长度：Step 5: Calculate the fixed steel bar length according to the following formula:
式中：d0为固定钢筋直径，一般取d0≥d；L为固定钢筋长度。In the formula: d0 is the diameter of the fixed steel bar, generally d0 ≥d; L is the length of the fixed steel bar.
本发明的有益效果：考虑了排数对锚筋的影响，具有较好的经济性；确定了锚筋弯折段和平直段的长度，保证了锚筋的锚固长度；限位板起到固定锚筋相对位置的作用；布置的固定钢筋对锚筋起到了辅助受力作用；为锚筋在外钢框架与水塔内直筒联合支撑体系实际工程应用中提供了合理可靠的设计方法。The beneficial effects of the present invention are as follows: the influence of the number of rows on the anchor bars is taken into consideration, and the invention has good economy; the lengths of the bent section and the straight section of the anchor bars are determined, and the anchoring length of the anchor bars is guaranteed; the limiting plates play a role in fixing the relative positions of the anchor bars; the arranged fixed steel bars play an auxiliary force-bearing role for the anchor bars; and a reasonable and reliable design method is provided for the actual engineering application of the anchor bars in the combined support system of the external steel frame and the straight tube in the water tower.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
图1是本发明实施例连接节点立面示意图；FIG1 is a schematic elevation diagram of a connection node according to an embodiment of the present invention;
图2是本发明实施例连接节点侧面示意图；FIG2 is a schematic side view of a connection node according to an embodiment of the present invention;
图3是本发明实施例连接节点平面示意图；FIG3 is a plan view of a connection node according to an embodiment of the present invention;
图4是锚筋细部做法示意图。Figure 4 is a schematic diagram of the anchor reinforcement details.
图中：1水塔直筒筒壁，2固定钢筋，3锚筋，31锚筋平直段，32锚筋弯折段，4限位板，5锚板，6外钢框架梁。In the figure: 1 water tower straight cylinder wall, 2 fixed steel bars, 3 anchor bars, 31 straight sections of anchor bars, 32 bent sections of anchor bars, 4 limit plates, 5 anchor plates, 6 external steel frame beams.
具体实施方式Detailed ways
下面结合附图，对外钢框架与水塔内直筒联合支撑体系的框架梁与直筒铰接连接节点锚筋的设计实例对本发明做进一步说明。The present invention will be further described below with reference to the accompanying drawings with reference to a design example of anchor bars for hinged connection nodes between frame beams and straight tubes of a combined support system of an external steel frame and straight tubes in a water tower.
实施例Example
一种外钢框架与水塔内直筒联合支撑体系的框架梁与直筒铰接连接节点锚筋的设计方法，其特征在于，锚筋弯折段水平放置，与固定钢筋双面焊接；以塞内加尔某水塔项目为例，该水塔为钢框架支撑与水塔竖向混凝土筒壁联合构成受力体系，抗震等级为三级，直筒总高40.7米，水塔的混凝土等级选用C30，钢材等级为Q355B，锚筋种类为带肋HRB335，抗拉强度设计值为300MPa，水塔直筒壁厚为300mm，钢梁型号为HM500×300×11×18，限位板尺寸为370×690×6mm，锚板尺寸为370×690×20mm。A design method for anchor bars at hinged connection nodes of a frame beam and a straight tube in a joint support system of an outer steel frame and an inner straight tube of a water tower is disclosed, characterized in that the bent section of the anchor bar is placed horizontally and welded to the fixed steel bar on both sides; taking a water tower project in Senegal as an example, the water tower is a force bearing system composed of a steel frame support and a vertical concrete tube wall of the water tower, with a seismic resistance level of three, a total height of the straight tube of 40.7 meters, C30 concrete grade of the water tower, Q355B steel grade, ribbed HRB335 anchor bar type, tensile strength design value of 300MPa, straight tube wall thickness of 300mm, steel beam model HM500×300×11×18, limit plate size of 370×690×6mm, anchor plate size of 370×690×20mm.
一种外钢框架与水塔内直筒联合支撑体系的框架梁与直筒铰接连接节点锚筋的设计方法包括以下步骤：A design method for anchor bars of a frame beam and a straight tube hinged connection node of a joint support system of an external steel frame and a straight tube in a water tower comprises the following steps:
步骤一：选择用于锚固的钢筋直径d＝27mm和排数n＝4；Step 1: Select the diameter of the steel bars used for anchoring, d = 27 mm, and the number of rows, n = 4;
步骤二：梁端节点区锚筋剪力标准值为392.649kN，拉力标准值为10.638kN，弯矩标准值为62.824kN·m，根据公式(1)～(4)计算出锚筋的总截面面积As≥5627.34mm2，锚筋布置见附图1～3；Step 2: The standard value of anchor shear force in the beam end node area is 392.649 kN, the standard value of tension force is 10.638 kN, and the standard value of bending moment is 62.824 kN·m. According to formulas (1) to (4), the total cross-sectional area of the anchor is calculated to be A s ≥ 5627.34 mm 2 . The layout of the anchor is shown in Figures 1 to 3.
步骤三：按照公式(5)计算出锚筋的锚固长度l≥848.34mm，取l＝870mm；Step 3: Calculate the anchorage length of the anchor bar l≥848.34mm according to formula (5), and take l＝870mm;
步骤四：按照公式(6)和公式(7)计算锚筋平直段和弯折段长度：Step 4: Calculate the length of the straight section and the bent section of the anchor bar according to formula (6) and formula (7):
lb≤T-min(6d，70mm)≤300-min(162，70mm)＝230mml b ≤T-min(6d,70mm)≤300-min(162,70mm)＝230mm
lc≥5d≥135mml c ≥5d≥135mm
取lb＝230mm，lc＝140mm；Take l b = 230 mm, l c = 140 mm;
步骤五：取d0＝d，按照公式(8)计算出固定钢筋长度L＝540mm。Step 5: Take d 0 = d, and calculate the fixed steel bar length L = 540 mm according to formula (8).
上述虽然结合附图对本发明的具体实施方式进行了描述，但并非对本发明保护范围的限制，所属领域技术人员应该明白，在本发明技术方案的基础上，本领域技术人员不需要付出创造性劳动即可做出的各种修改或变形仍在本发明的保护范围内。Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Technical personnel in the relevant field should understand that various modifications or variations that can be made by technical personnel in the field without creative work on the basis of the technical solution of the present invention are still within the scope of protection of the present invention.
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