CN110096806A - A kind of simple algorithm of determining CONSTRUCTION OF CABLE-STAYED BRIDGE initial tensioning Suo Li - Google Patents

Abstract

The present invention provides the simple algorithms of determining CONSTRUCTION OF CABLE-STAYED BRIDGE initial tensioning Suo Li a kind of, belong to technical field of bridge engineering.The algorithm is on the basis of forward iteration method, overcome the cumbersome difficulty for calculating complexity of determining CONSTRUCTION OF CABLE-STAYED BRIDGE initial tensioning Suo Li, software can be analyzed in conjunction with existing structure, secondary development is carried out without programming or to existing software, this method is easy to operate, clear concept has very high validity and practicability.

Description

A kind of simple algorithm of determining CONSTRUCTION OF CABLE-STAYED BRIDGE initial tensioning Suo Li

Technical field

The invention belongs to technical field of bridge engineering, and in particular to a kind of simplicity of determining CONSTRUCTION OF CABLE-STAYED BRIDGE initial tensioning Suo Li Algorithm.

Background technique

Cable-stayed bridge is as high order statically indeterminate structure, using the construction method being gradually completing stage by stage.The knot of final Cheng Qiaohou Structure dead load internal force and main beam linear and work progress are closely related, and stayed-cable bridge structure system and loading status be all in the construction process Constantly variation, so structural internal force and deformation also constantly change therewith.It therefore must construction simulation process in design calculating In each process, determine reasonable Construction State, cable-stayed bridge Cheng Qiaohou made to reach reasonable finished dead state.

After completing the design of cable-stayed bridge reasonable finished dead state, it should determine rationally to apply according to construction method and specific process Suspension cable initial tension under work state.Determine that the method for reasonable construction state mainly tears method open at present, formal dress-tears iterative method open And stress-free state method, tear method open has uneven rod end power to influence removing closure segment often, due to concrete shrinkage, creep with And geometric nonlinear, when construction procedure is more complicated, it is difficult to be closed, be difficult to acquire more accurate solution；Formal dress iteration Method analyzes the reasonable construction drag-line initial tension of determining bridge and linear using the sequence of systemic circulation, and this method approximate can only consider Concrete shrinkage, the geometrical non-linearity crept with structure, calculate comparatively laborious, heavy workload, and convergence rate is slow；Unstress state Method application is more difficult, inconvenient for operation.

Summary of the invention

To solve the above problems, the invention discloses the simple algorithm of determining CONSTRUCTION OF CABLE-STAYED BRIDGE initial tensioning Suo Li a kind of, behaviour Make simplicity, clear concept, calculation amount is small, and error is small, practical.

In order to achieve the above objectives, technical scheme is as follows:

A kind of simple algorithm of determining CONSTRUCTION OF CABLE-STAYED BRIDGE initial tensioning Suo Li, comprising the following steps:

Step 1 drafts one group of initial tensioning Suo Li { T₀}；

Step 2 establishes finite element model, carries out forward-analysis method according to work progress, obtains structure bridge completion state Suo Li {F₀}；

Step 3, by calculated result compared with reasonable finished dead state, Suo Liwei { N } under reasonable finished dead state, calculating is not closed Measure { Δ F₀}={ N }-{ F₀}；

Step 4 adjusts initial tensioning Suo Li, the initial tensioning Suo Liwei { T of next round input₁}={ T₀}+{ΔF₀}；

Step 5 starts new round iterative calculation, in initial tensioning Suo Li { T₁Under the action of, it is drawn when calculating to bridge completion state Suo Liwei { F₁, { F₁And { N } between difference be { Δ F₁}={ N }-{ F₁}；

Step 6 repeats step 4~step 5, until

The beneficial effects of the present invention are:

1, the present invention combines forward iteration method, determines to obtain the simple algorithm of CONSTRUCTION OF CABLE-STAYED BRIDGE initial tensioning Suo Li a kind of.

2, it the present invention overcomes determining that CONSTRUCTION OF CABLE-STAYED BRIDGE initial tensioning Suo Li is cumbersome to calculate complicated difficulty, can combine Existing structure analyzes software, carries out secondary development without programming or to existing software, this method is easy to operate, and concept is clear It is clear, it constantly computes repeatedly, precision is high, there is very high validity and practicability.

Detailed description of the invention

Fig. 1 is the flow chart present invention determine that the simple algorithm of CONSTRUCTION OF CABLE-STAYED BRIDGE initial tensioning Suo Li.

Specific embodiment

With reference to the accompanying drawings and detailed description, the present invention is furture elucidated, it should be understood that following specific embodiments are only For illustrating the present invention rather than limiting the scope of the invention.

The simple algorithm of determining CONSTRUCTION OF CABLE-STAYED BRIDGE initial tensioning Suo Li provided by the invention, includes the following steps: to draft first Initial tensioning Suo Li obtains bridge completion state Suo Li by just intending Suo Li forward-analysis method, according to bridge completion state Suo Li and rationally at bridge like The not closing capacity of state Suo Li is adjusted initial tensioning Suo Li, and iterative calculation makes bridge completion state Suo Liyu reasonable finished dead state rope Power matches.As shown in Figure 1, specific steps are as follows:

Draft initial tensioning Suo Li { T₀(rational bridging cable force usually can be used directly)；

Forward-analysis method, which is carried out, according to the work progress of cable-stayed bridge (is included in geometrical non-linearity, concrete shrinkage, the shadows such as creep Ring), obtain structure bridge completion state Suo Li { F₀}；

By calculated result compared with reasonable finished dead state, Suo Liwei { N } under reasonable finished dead state calculates not closing capacity { Δ F₀}={ N }-{ F₀}；

Adjust initial tensioning Suo Li, the initial tensioning Suo Liwei { T of next round input₁}={ T₀}+{ΔF₀}；

Start new round iterative calculation, in initial tensioning Suo Li { T₁Under the action of, drag-line power is when calculating to bridge completion state {F₁, { F₁And { N } between difference be { Δ F₁}={ N }-{ F₁}；

Iteration calculating process, until

The technical means disclosed in the embodiments of the present invention is not limited only to technological means disclosed in above embodiment, further includes Technical solution composed by arbitrarily being improved by the above technical characteristic.

Claims (1)

1. a kind of simple algorithm of determining CONSTRUCTION OF CABLE-STAYED BRIDGE initial tensioning Suo Li, it is characterised in that: the following steps are included:

Step 1 drafts one group of initial tensioning Suo Li { T₀}；

Step 2 establishes finite element model, carries out forward-analysis method according to work progress, obtains structure bridge completion state Suo Li { F₀}；

Step 3, by calculated result compared with reasonable finished dead state, Suo Liwei { N } under reasonable finished dead state calculates not closing capacity {ΔF₀}={ N }-{ F₀}；

Step 4 adjusts initial tensioning Suo Li, the initial tensioning Suo Liwei { T of next round input₁}={ T₀}+{ΔF₀}；

Step 5 starts new round iterative calculation, in initial tensioning Suo Li { T₁Under the action of, drag-line power is when calculating to bridge completion state {F₁, { F₁And { N } between difference be { Δ F₁}={ N }-{ F₁}；

Step 6 repeats step 4~step 5, until