Prestressed/post-tensioned concrete bridges - Computational Analysis and Design of Bridge Structures - page 165

−8694 −8720 −9055

−8174 −7624

−5958 −6098 −7189 −7548

−5351 −5752 −6812

−7047

−6668 −5726

−5958

−3827 −3879

−5336

−3376 −3826 −4806

−3472

−4951

−2819
E121 E123 E125 E127 E129

E132 E130E184E180E176 E172E168E164 E160 E156 E152 E148E144 E140E136

E138 E142 E146E150 E154E158E162 E166E170E174 E178E182E186E188 E190E192

E109
E111
E112

−6

−2720
−4420
−6119

E113
E114

Figure 5.41 Stress (kN/m 2 ) distributions on the top flange of the box girder after closure.

−8472 −8610 −9084

−8428 −8019

−6820 −7249

−6299

−6281 −6428

−6035

−5042 −5327

−5303

−4471 −5520 −5702

−3709 −3773

−3266 −3614

−4668

−2684 −4134

−2795

E121 E123 E125 E127 E129 E132 E130E184E180 E176E172E168 E164E160 E156E152E148 E144E140 E136

E138E142 E146 E150E154E158 E162E166E170 E174E178E182 E186E188E190E192

−6

E109
E111
E112

−3593
−6074
−8555

E113
E114

Figure 5.42 Stress (kN/m 2 ) distributions on the top flange of the box girder after 27 years.

−293 −349 −420 −500 −599 −711 −838 −975 −1130 −1448 −1669 −2018 −2178

−1846 −1922 −1752

−1130 −1322

−819 −617 −466 −339 −240 −163−107 −67 −40 936

5 56 107 219 333 442

546 603 692 650 656 654 645 677 739 824 945 1070

797 692 606 592 581 571 −1610

−1174

1026

0 1254

−1802 −5771 1474

4178 1445 615
2428

2154

−3401

908
1465

−1280

−1276

3782 −2981

Figure 5.43 Stress (kN/m 2 ) distributions on the top flange of the box girder due to four
lanes of AASHTO live loads.

extreme stress is calculated by loading over the stress influence surfaces or
influence lines, not over the simple axial force or bending moment.

5.7 illustrated exaMPle of long- sPan
concrete cantileVer Bridges—Jiangsu,
PeoPle's rePuBlic of china

The long-span prestressed concrete continuous rigid-frame bridges are
usually built with the balanced cantilever method. The layout of longi-
tudinal tendons is determined according to the stress states in the can-
tilever stage and completion stage, and the tendons are correspondingly
divided into cantilever tendons and continuity tendons (Pan et al. 2010).